1 . Driven by a sense of commitment, a great many joined the army ______(resist) the Japanese invaders and defend the honour of the nation. (所给词的适当形式填空)

2 . More and more young people move to big cities because they have the opportunity _________ (get) high-paid jobs. (所给词的适当形式填空)

3 . We had no choice but________(exercise) our own judgment to solve the problem. （所给词的适当形式填空）

4 . They had a heated discussion on whether ________(adopt) a different approach to processing information.